57145815 has 12 divisors (see below), whose sum is σ = 99052824. Its totient is φ = 30477744.

The previous prime is 57145801. The next prime is 57145831. The reversal of 57145815 is 51854175.

57145815 is a `hidden beast` number, since 5 + 71 + 4 + 581 + 5 = 666.

It is not a de Polignac number, because 57145815 - 2⁵ = 57145783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57145815.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 634909 + ... + 634998.

It is an arithmetic number, because the mean of its divisors is an integer number (8254402).

Almost surely, 2^57145815 is an apocalyptic number.

57145815 is a deficient number, since it is larger than the sum of its proper divisors (41907009).

57145815 is a wasteful number, since it uses less digits than its factorization.

57145815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269918 (or 1269915 counting only the distinct ones).

The product of its digits is 28000, while the sum is 36.

The square root of 57145815 is about 7559.4851015132. The cubic root of 57145815 is about 385.1780028070.

It can be divided in two parts, 571458 and 15, that multiplied together give a triangular number (8571870 = T₄₁₄₀).

The spelling of 57145815 in words is "fifty-seven million, one hundred forty-five thousand, eight hundred fifteen".